ISO INTERNATIONAL STANDARD 4689-2 Third edition 2017-03 Iron ores Determination of sulfur content - Part 2: Combustion/titration method Minerais de fer - Dosage du soufre - Partie 2: Methode par combustion et titration Reference number ISO 4689-2:2017(E) so International Organization for Standardization @ IS0 2017 ZHEJIANG INSTOFSTANDARDIZATION C15956617 vided by IHS under ted without license from IHS IS0 4689-2:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org PrganizationforStandardization ensee-ZHEJIANG INST OF STANDARDIZRoISQ $17 - All rights reserved Not for Resale, 2017/5/11 01:42:53 etworking permitted without license from IHS IS0 4689-2:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions ..1 4 Principle .1 5 Reagents. .2 6 Apparatus ..2 7 Sampling and samples. .5 7.1 Laboratory sample. .5 7.2 Preparation of predried test samples. .5 8 Procedure .5 8.1 Number of determinations .5 8.2 Testportion .5 8.3 Blank test and check test. .5 8.4 Determination .6 9 Expression of results .7 9.1 Calculation of sulfur content .7 9.2 General treatment of results .7 9.2.1 Repeatability and permissible tolerance .7 9.2.2 Determination of analytical result .8 9.2.3 Between-laboratories precision .8 9.2.4 Check for trueness. .8 9.2.5 Calculation of final result .9 10 Test report. 9 Annex A (normative) Flowsheet of the procedure for the acceptance of analytical values for test samples 11 Annex B (informative) Derivation of repeatability and permissible tolerance equations ..12 Annex C (informative) Precision data obtained by international analytical trial ..13 Bibliography .14 iii ithout license from IHS